From 95649c425fa2805b76f183c27aeed93f159e47cc Mon Sep 17 00:00:00 2001
From: Peter Huewe <peterhuewe@gmx.de>
Date: Thu, 14 Jun 2012 00:21:40 +0200
Subject: [PATCH] staging/xgifb: Add mutext for fb_mmap locking

This adds a mutex for fb_mmap around smem_start and smem_len
so the mutex inside the fb_mmap() is actually used.  Changing of
these fields before calling the framebuffer_register() are not mutexed.

We check whether framebuffer_register has been called by reading
fbinfo->count.

See 537a1bf0 - "fbdev: add mutex for fb_mmap locking" by Krzysztof Helt
for details.

Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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